Why is Russia against Israel?

Religious Answer

Because quite simply they are antichrist. They do not believe in God. But they are not the only ones. Most western countries, arguably America included, have become antichrist. We have a large Christian population but I do not see it as a majority any more. I think God will intervene and save Israel in the last days. I no longer look to a nation such as the United States.

Geopolitical Answer

Russia in its Soviet Days chose to support the Arab States against the United States supported Israel in order to engage in proxy wars with the Americans. Russian continuing support of the Arab World necessarily pushes it to oppose Israel. The Arab World continues to buy outdated Russian weaponry and use Russian technological expertise in Oil Drilling and Export. Furthermore, it gives Russia more petroleum leverage. (Considering that the Middle East and Russia have the two largest petroleum reserves, the two can effectively direct policy when working in tandem.) This type of leverage allows Russia to remain a major player on the world-stage and influencing politics.

As for Russia being un-Christian, this is not the case. Russia is majority Russian Orthodox, a faith that was suppressed during the Soviet Era, but has now come back relatively strongly. Russia is not as religious as the United States, but more religious than Western Europe.